Json parsing error with content moderation

Confirm this is an issue with the Python library and not an underlying OpenAI API

• This is an issue with the Python library

Describe the bug

Hello,

I've seen an example where I'm submitting to the responses.parse endpoint, and I get back a pydantic validation error. Upon inspection, it looks like the model is returning "I'm sorry, but I cannot assist you with that request.", which obviously fails to json parsing step.

I'd expect it to raise something like a APIResponseValidationError (if not something more specifically related to moderation), instead of a pydantic_core.ValidationError.

To Reproduce

I've found it very difficult to reproduce as the original example is from internal business documents I cannot share, and my attempts to trigger that response have failed.

The basic steps are:

1. Create client
2. Submit problematic prompt to client.responses.parse with text_format= pydantic schema
3. Observe error

For context, I am using the async client, through Microsoft AI Foundry, with chatgpt-4.1-mini, and the content filter is DefaultV2. The Foundry API version is 2025-03-01-preview.

Code snippets

from openai import AsyncAzureOpenAI
credential = DefaultAzureCredential(logging_enable=True)
openai_client = AsyncAzureOpenAI(
        api_version="2025-03-01-preview",
        azure_endpoint=xxx,
        azure_ad_token_provider=get_bearer_token_provider(
            credential,
            "https://cognitiveservices.azure.com/.default",
        ),
)
await openai_client.responses.parse(
    input=prompt,
    text_format=pydantic_schema
)

OS

Windows 11

Python version

Python 3.12.3

Library version

openai 2.15.0

Start at the client.responses.parse entry point and trace how a moderation refusal is handled before Pydantic validation, using the async Azure configuration and response format described in the issue. Done means the behavior is reproducibly characterized and the refusal raises the library's intended API response or moderation-related error instead of a raw pydantic_core.ValidationError.